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In the developed world, life expectancies are higher than ever before. As a result, an increasing number of people are at risk of neurodegenerative disease in old age. While the predominantly motor disturbance of Parkinson’s disease may be complicated by subcortical dementia in some patients, Alzheimer’s disease and dementia with Lewy bodies (DLB) are the two most common forms of cortical dementia.’ ‹’ ‹